If a volume of air is warmed, it expands. If a volume of air expands, it
A) warms.
B) cools.
C) neither of these
Answer: B
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If the net work done on an object is positive, then the object's kinetic energy
A) decreases. B) remains the same. C) increases. D) is zero. E) cannot be determined without knowing the object's mass.
You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 4 cm wide but 7 mm high. You must move your hand up and down once,
A. the same distance up as before, but take a shorter time. B. the same distance up as before, but take a longer time. C. a smaller distance up, but take a shorter time. D. a greater distance up, but take a longer time. E. a greater distance up, but take the same time.
How does the solar nebula theory account for the presence of comets?
What will be an ideal response?
The oxygen molecules and the nitrogen molecules at any one place in our atmosphere are at the same temperature. How do the root-mean-square speeds of the two molecules compare?
A) same B) N2 > O2 C) O2 > N2